<template>
  <div class="row">
    <div v-for="column in columnList" :key="column._id" class="col-4 mb-4">
      <div class="card h-100 shadow-sm">
        <div class="card-body text-center">
          <img :src="column.avatar && column.avatar.url" alt="column.title" class="rounded-circle border border-light my-3" />
          <h5 class="card-title">{{ column.title }}</h5>
          <p class="card-text text-left">{{ column.description }}</p>
          <router-link :to="`/column/${column._id}`" class="btn btn-outline-primary">进入专栏</router-link>
        </div>
      </div>
    </div>
  </div>
</template>

<script lang="ts">
import { computed, defineComponent, PropType } from 'vue';
import { ColumnProps } from '../store';

export default defineComponent({
  name: 'ColumnList',
  props: {
    list: {
      type: Array as PropType<ColumnProps[]>,
      required: true,
    },
  },
  setup(props) {
    const columnList = computed(() => {
      return props.list.map(item => {
        if (!item.avatar) {
          item.avatar = {
            url: require('assets/column.jpg'),
          };
        } else {
          // 阿里云oss进行图片处理（裁剪、缩放、旋转等）
          item.avatar.url = item.avatar.url + '?x-oss-process=image/resize,m_pad,h_50,w_50';
        }
        return item;
      });
    });

    return { columnList };
  },
});
</script>

<style lang="scss" scoped>
.card-body img {
  width: 50px;
  height: 50px;
}
</style>
